IMPROVEMENT OF THERMOMECHANICAL TESTING OF POLYMERS THROUGH AUTOMATIC RECORDING

Abstract

The method of thermomechanical curves, used extensively in the USSR for determining mechanical properties of polymers at varying temperatures, is discussed. A fully automatic laboratory device has been constructed for recording the values of monoaxial compression of a polymer at gradually increased temperatures, while the polymer changes state from the glassy (or vitreous) to the highly elastic, and finally to the viscous-plastic. The points on the generally S-shaped thermomechanical curve representing these changes of state are the glss-transition point Tg and flow point Tf. In the new device monoaxial compression is produced by the pressure of an interchangeable load on the specimens while they are being subjected to temperature variations in the -120 to 400 C range. The dimensional changes are converted into electric signals and recorded continuously. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 22, 1961
Accession Number
AD0260422

Entities

Organizations

  • Library of Congress

Tags

DTIC Thesaurus Topics

  • Automatic
  • Compression
  • Mechanical Properties
  • Physical Properties
  • Poisson Ratio
  • Transitions

Readers

  • Aerospace Test and Evaluation
  • Electrochemical Surface Science
  • Structural Health Monitoring of Composite Structures.